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dc.contributor.advisorVargas Rosales, César
dc.contributor.advisorZareei, Mahdi
dc.creatorVelázquez Gutiérrez, Juan Manuel
dc.date.accessioned2018-12-10T20:10:34Z
dc.date.available2018-12-10T20:10:34Z
dc.date.created2018-12-01
dc.identifier.citationVelazquez-Gutierrez, JM. (2018). Reception of Multiple Users in Reconfigurable Wireless Networks (tesis doctoral). ITESM, Monterrey, México.en_US
dc.identifier.urihttp://hdl.handle.net/11285/632431
dc.description.abstractThe next generation of wireless networks (WNs) will confront important challenges pre- sented by the high density and convergence of wireless elements (WEs), their influence on our lifestyle, and the proliferation of new paradigms of wireless communication systems. Co- existence, mobility, and multiple access are some issues widely studied in order to ensure their operation. In this work. it is introduced a framework of WNs considering association schemes, networking, and coexistence aspects which are useful concepts to describe their fea- tures and the relationship among elements. Code division multiple access (CDMA) systems are considered as attractive models to future wireless communication systems (WCS) in order to affront the new and changing challenges. Traditional direct sequences - code division multiple access (DS-CDMA) and double codification division multiple access (C2DMA) models provide engaging features given that offer continuous access to the wireless channel to every user, i.e. they permit coexistence of multiple users at the same time. These models are interference limited systems what make them vulnerable to usual issues in dynamic networks such as the Near-Far problem, Hidden and exposed terminals interference, etc. However, C2DMA model has been shown addi- tional properties that makes it attractive to reconfigurable wireless networks (RWNs) due to its robustness to interference. It considers a double correlation technique which provides si- multaneous reception and motivates the study of sequences used as codes in order to increase their use and visualise some applications. This work considers current and new sets of codes through an exhaustive search of useful sequences for both models. First, desired properties are identified for each model, next known sequence sets are tested with these properties. After that, an exhaustive search algorithm is used in order to select and group sequences to form all the possible code sets with desired properties. Finally, these models are tested in challenging scenarios in order to examine their performance and persuade about their potential in future WNs.en_US
dc.description.tableofcontentsAbstract v List of Figures vii List of Tables viii 1 Introduction 1 1.1 Motivation.................................... 2 1.2 ProblemStatementandContext ........................ 2 1.3 ResearchQuestions............................... 3 1.4 SolutionOverview ............................... 3 1.5 Objectives.................................... 3 1.6 Contributions .................................. 3 1.7 ThesisOrganization............................... 4 2 Wireless networks: Association, Networking, and Coexistence 5 2.1 Introduction................................... 5 2.2 Associationschemes .............................. 6 2.2.1 Collaborativescheme.......................... 7 2.2.2 Cooperativescheme .......................... 8 2.3 Networking ................................... 8 2.3.1 Networkingprocess .......................... 8 2.4 Coexistenceinwirelessnetworks........................ 11 2.4.1 Coexistenceschemes.......................... 12 2.5 AspectsofWirelessnetwork........................... 14 2.6 WNsclassification ............................... 17 2.6.1 ClassificationsbasedonWEs ..................... 17 2.6.2 ClassificationsbasedonWNaspects.................. 18 2.6.3 Classificationsbasedonothersaspects. . . . . . . . . . . . . . . . . 20 3 Reconfigurable Wireless Networks and CDMA systems 22 3.1 Introduction................................... 22 3.2 Codedivisionmultipleaccess(CDMA) .................... 25 3.3 TypesofschemesbasedonCDMAsystem .................. 25 3.3.1 Direct-SequencesCDMA(DS-CDMA)system . . . . . . . . . . . 26 3.3.2 CDMA with double codification (C2DMA) system . . . . . . . . . . 28 3.4 Relatedworks ................................. 30 3.4.1 DS-CDMAsystemsandRWN .................... 30 3.4.2 CDMAsystemsusingtwocodes ................... 31 3.5 RWNbasedonCDMAsystems:Adiscussion................. 31 4 An analysis of known sequence sets 34 4.1 TheCDMAsystemandspreadingcodes: properties . . . . . . . . . . . . . . 34 4.2 CorrelationmatrixandSide-lobesgraph.................... 35 4.2.1 Correlationmatrix............................ 35 4.2.2 Side-lobescorrelationgraph ...................... 36 4.3 Analysisofcodesets .............................. 37 4.3.1 Hadamardsequencessets........................ 38 4.3.2 Complementarysequencessets..................... 49 4.3.3 Interference-FreeWindowsets..................... 65 4.3.4 Observations .............................. 79 5 Exhaustive search of codes 80 5.1 Sequenceselectionmethod........................... 80 5.2 SelectionofsequenceswithN=8....................... 81 5.2.1 Binarysequences............................ 81 5.2.2 Nonegativesequences ......................... 83 5.2.3 Balance................................. 83 5.2.4 Correlation ............................... 85 5.2.5 Shifting................................. 99 5.3 SelectionofsequenceswithN=16 ...................... 103 5.3.1 Walsh-HadamardsetW(15) ...................... 105 5.3.2 Golay-HadamardsetG(16) ....................... 106 5.4 Observations .................................. 110 6 Simulations and Results 111 6.1 CDMAsystemsandnewcodessets ...................... 111 6.1.1 Singleuserscenarioandsinglepath .................. 111 6.1.2 IFWsubsetsandDS-CDMAmodel .................. 112 6.2 RWNandC2DMAmodel ........................... 113 6.2.1 Scenario 1: Direct-Communication configuration . . . . . . . . . . . 114 6.2.2 Scenario2:Ad-Hocconfiguration ................... 114 6.2.3 Scenario3:Centralizedconfiguration ................. 115 6.2.4 Scenario 4: Simultaneous transmissions (Broadcast) . . . . . . . . . 115 6.3 ApplicationsandArchitecturenetworks .................... 116 7 Conclusions and Future work 119 A Bit Error Rate 121 A.1 BERforBinaryPhaseShiftKeying(BPSK)modulation . . . . . . . . . . . 121 A.1.1 Mathematicalmodel .......................... 121 A.1.2 Simulationmodels ........................... 123en_US
dc.format.extent141 páginasen_US
dc.format.mediumTextoen_US
dc.language.isoengen_US
dc.publisherInstituto Tecnológico y de Estudios Superiores de Monterreyesp
dc.relation.ispartofN/Aen_US
dc.rightsOpen Accessen_US
dc.rightsCC0 1.0 Universal*
dc.rights.urihttp://creativecommons.org/publicdomain/zero/1.0/*
dc.subject7 INGENIERÍA Y TECNOLOGÍAen_US
dc.titleReception of Multiple Users in Reconfigurable Wireless Networksen_US
dc.typeTesis Doctorado / doctoral Thesisen_US
dc.contributor.mentorMorales, Rubén
dc.publisher.institutionInstituto Tecnológico y de Estudios Superiores de Monterreyen_US
dc.subject.keywordAssociationen_US
dc.subject.keywordNetworkingen_US
dc.subject.keywordcoexistenceen_US
dc.subject.keywordspreading codesen_US
dc.subject.keywordCDMAen_US
dc.subject.keywordWireless Networksen_US
dc.contributor.institutionSchool of Engineering and Sciencesen_US
dc.contributor.institutionSchool of Engineering and Sciencesen_US
dc.contributor.institutionCampus Monterreyen_US
dc.subject.disciplineIngeniería y Ciencias Aplicadas / Engineering & Applied Sciencesen_US
dc.description.degreeDoctor of Philosophy in Information Technologies and Communicationsen_US
dc.audience.educationlevelInvestigadores/Researchersen_US
dc.date.Accepted2018-12-04


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